The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 26, 2000
Filed:
Jun. 26, 1998
Steven M Stojic, Holland, MI (US);
Holland Neway International, Inc., Muskegon, MI (US);
Abstract
A spring brake actuator (10), with a first spring brake chamber (76) filled with compressed air and a second spring brake chamber (78) housing a large-force compression spring (82), includes an elastomeric diaphragm (74) having a centrally-disposed aperture (90) separating the first and second spring brake chambers (76 and 78). The elastomeric diaphragm (74) is compressed at a peripheral edge (138) between housing sections (66, 68) and at a collar (140), which is adjacent the centrally-disposed aperture (90), between a ring-shaped retainer (142) and at least one of an actuator rod, a pressure plate (92), and an annular recess (144) in a pressure plate (92). In one embodiment, the retainer (142) includes an annular channel (154) having an inner rim (150), an outer rim (152), and a base (156). Evenly-spaced flanges (146) radiate axially from, and are separated by slots (148) on, the inner rim (150). The groove (144) is adapted to receive the base (156) of the channel (154), with the collar (140) of the elastomeric diaphragm (74) secured therebetween, and the flanges (146) secure the retainer (142) therein. In a further embodiment, the retainer (242) includes an inner rim (150) having a flange (256), a ramped outer rim (252), and a base (290). The annular recess (244) is adapted to receive the base (156) of the channel (154) and the flange (256), with the collar (240) of the elastomeric diaphragm (274) secured therebetween, whereby the friction fit aided by the ramped outer rim (252) and the flange (256) secures the retainer (242) therein.